If you need a simplest and most advanced wireless Multi Speaker for iPhone, iPad + Android devices ever in the compact form, go for "HiddenRadio2 Bluetooth MultiSpeaker" by Hidden Radio Design, currently crowd-funding at Kickstarter. Using Multi-Speaker Bluetooth, you can link two HiddenRadio2’s to one phone. Simply touch the cap or hit play on your phone, and the cap magically lifts, revealing the speaker hidden beneath, as your HiddenRadio2 begins to stream crystal clear music in 360-degree sound. By simply tapping the cap, you can play, pause, adjust the volume, skip forward or back, fast forward or rewind, answer a phone call, or even activate Siri directly from the HiddenRadio2.